1. the quality of being timid, shy, or lacking in confidence
2. the quality of being dull, colorless, or unremarkable in appearance

Examples

• Her mousiness made it difficult for her to speak up in meetings.
• The teacher encouraged students to overcome their mousiness and participate more actively.
• The mousiness of her brown hair made her blend into the crowd.
• His mousiness was mistaken for rudeness by those who didn’t know him well.
• She worked hard to shed her childhood mousiness and become more outgoing.
• The mousiness of the room’s decor made it feel uninviting.